The company’s marketing approach is heavily weighted to parents of young women, but the service appears worth considering for anyone with worries about a loved one’s physical safety.

Given the high subscription cost, it is perhaps not surprising that the service includes an element of live assistance.

If users feel as if they are in a potentially dangerous situation, but one that isn’t yet to the point where a 911 call is needed, they would open StreetSafe’s “Walk with Me” feature. The app then connects to one of the company’s safety advisers, who tracks the user’s whereabouts via GPS and offers safety tips. If the situation becomes dangerous, the adviser calls 911 and relays the user’s location.

If a user encounters a dangerous situation more suddenly, StreetSafe’s “silent alarm” feature allows him or her to call 911 with a swipe of the finger. The app transmits the user’s location to emergency personnel.

As with any GPs-reliant app, StreetSafe will drain a battery more quickly than other apps, but since users will only keep it open briefly in most instances, that’s hardly a deal-breaker.

A version of this article appears in print on 06/07/2012, on page B10 of the NewYork edition with the headline: An App Offers Someone to Watch Over You.

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